Essentially, buy 2 iTunes cards and you get the 2nd one at 25% off, so effectively a 12.5% off (2x20 for 35, 2x30 for 52.5, 2x100 for 175).
Website says end 9/10/2013, but Bourke Street (Melb) store today said promo extended till 23-10-2013. Not as good as 2 for $30, but still a discount.
This is most likely an in-store only deal.
That works out at 12.5% off…
Hardly a bargain… Just wait for the next 20%/25% off next month…